From a happy pregnancy announcement to a shallow grave: The full timeline of the Chris Watts murder case

In November, Chris Watts got three consecutive life sentences for the August slayings of his pregnant wife, Shanann Watts, and their daughters, Bella, 4, and Celeste, 3.

Over the summer, as Shanann Watts tried to save her marriage, Chris Watts went from a loving husband to a killer.

Combing through phone records, texts, photos, and police records, this is the full timeline of the Chris Watts murder case.

On August 13, the faces of pregnant Shanann Watts and her two daughters, 4-year-old Bella and 3-year-old Celeste, were printed on missing-person posters after they suddenly disappeared from their home in Frederick, Colorado.

At first, Shanann Watts' husband, Chris Watts, agreed to TV interviews, in which he appeared torn up over their sudden disappearance and begged for their safe return.

Just two days later, he was arrested in connection with their deaths.

On social media, the couple seemed like they had a perfect marriage. But Chris Watts had secretly started seeing a coworker, telling her that he and his wife were in the process of separating.

While Shanann Watts spent most of the summer in North Carolina with relatives, he spent more and more time with his new girlfriend, and his wife noticed him growing distant. She desperately tried to salvage their relationship.

When she returned from a business trip the morning of August 13, she and Chris Watts got into a fight, which would end with 15-weeks-pregnant Shanann Watts being strangled to death and their two daughters smothered.

Despite Chris Watts' waning affections, nothing seems to explain what possessed him to kill his family.

This is the full timeline of the grisly case, culled from police records.

1/

June 11: Shanann Watts records videos of her surprising her husband with the news that she's pregnant for a third time.

June 14: Shanann Watts records a video of Bella singing a song about how much she loves her dad.

Bella is pictured singing: "My daddy is a hero/ He helps me grow up strong/ He helps me snuggle too/ He reads me books/ He ties my shoes/ You're a hero through and through/ Daddy, Daddy, I love you."

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June 14: Chris Watts enters coworker Nichol Kessinger's contact information into his phone. Kessinger would later become his mistress.

A picture of Chris Watts and Nichol Kessinger found on Watts' phone.
Weld County DA

Nichol Kessinger said she started dating Watts seriously at the end of June.

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June 17: Kessinger tells police that sometime before Father's Day, Chris Watts tells her he is married and has kids but is in the process of separating. On Father's Day, Shanann Watts writes a tribute to him on Facebook.

Weld County DA

"Chris, we are so incredibly blessed to have you!" she wrote, according to HuffPost. "You do so much everyday for us and take such great care of us. You are the reason I was brave enough to agree to number 3!"

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June 19: Shanann Watts shares a picture from her first ultrasound and writes that her husband is the "best dad us girls could ask for."

An ultrasound image of the Watts' unborn son.
Weld County DA

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June 27: Shanann Watts takes Bella, right, and Celeste, left, to North Carolina for a five-week vacation, while her husband stays at home and works.

July 4: Kessinger told police she went to Chris Watts' house for the first time on the Fourth of July to "set up his diet and weight loss/exercise goals." "He invited her to his home, he cooked lunch, they ate and she left," according to police documents.

July 14: Chris Watts and Kessinger go on a date to a car museum. That afternoon, Shanann Watts makes four unanswered calls to her husband.

July 18: Kessinger sends Chris Watts seminude photos of herself, which he stores on a secret calculator app on his phone.

One of the pictures of Kessinger found on Watts' phone.
Weld County DA

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July 28: Chris Watts and Kessinger visit the Great Sand Dunes National Park and spend the night at a nearby campground.

The two went sandboarding during their two-day trip.
Weld County DA

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July 30: Chris Watts gives Kessinger a love letter before leaving town to join his family on their summer vacation.

Weld County DA

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The inside of the letter contains lyrics to the song "Down to Earth" by the band Through the Roots.

Weld County DA

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July 31: Chris Watts flies to North Carolina for the final week of his family's vacation. His and Shanann Watts' reunion does not appear to be happy, according to a copy of a text Shanann Watts sent to her husband, which she later forwarded to a friend.

Weld County DA

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August 4, 12:45 a.m.: Shanann Watts sends her husband a long text message accusing him of failing to stand up for her after his parents exposed their daughter Celeste to nuts, which she was allergic to.

Weld County DA

17/

August 4: Shanann Watts appears to have had a fight with her in-laws, which caused them to skip Celeste's birthday party that summer. She also tells her husband that he hasn't shown any signs of missing her in the weeks they have been apart.

Weld County DA

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August 4: While Chris Watts is away, Kessinger searches for wedding dresses on the internet for over two hours, according to a review of her cellphone data.

Watts and Kessinger in July.
Weld County DA

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August 7: Shanann Watts starts confiding in friends about her problems with her husband.

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August 9: Shanann Watts tells a friend that Chris Watts went to her ultrasound but he was cold to her, so she decided to cancel the baby's gender-reveal party.

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August 9: Shanann Watts leaves for a quick business trip to Arizona. On the way there, she tells a friend that she had her "best talk yet" with Chris Watts the night before.

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August 9: Shanann Watts texts a friend a handwritten letter she has drafted to give to her husband, in which she says she doesn't know how they "fell out of compatibility," as he has said.

Weld County DA

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August 11: Chris Watts hires a babysitter, saying he's going to a Colorado Rockies game with his coworkers. In reality, he takes Kessinger on a date to The Lazy Dog Sports Bar and Grill in Erie, Colorado.

August 13, 1:48 a.m.: A neighbor's surveillance camera captures Shanann Watts returning home from her business trip to Arizona.

At 5:27 a.m., the same surveillance camera shows Chris Watts backing his truck into his garage and loading it up before driving off. Prosecutors said Shanann Watts, Bella, and Celeste were killed in the house sometime during that three-hour period.

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August 13, 10:10 a.m.: After disposing of the bodies of his wife and daughters at an oil site where he works, Chris Watts looks up the lyrics to a Metallica song, "Battery."

The song contains the lyrics: "Smashing through the boundaries/ Lunacy has found me/ Cannot stop the battery/ Pounding out aggression/ Turns into obsession/ Cannot kill the battery/ Cannot kill the family."

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August 13, 12:27 p.m.: The Watts' realtor reaches out to the couple, and Chris Watts chats with her about the current state of their home and what they're looking for in a new house.

Weld County DA

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August 13: At one point the realtor questions why Shanann Watts hasn't weighed in on their conversation. "She hasn't been around all day," Chris Watts responds. "It's very odd."

Weld County DA

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August 13, 1:40 p.m.: Shanann Watts' friend Nickole Atkinson, left, reports her missing when she can't get ahold of her.

Weld County DA

Nickole Atkinson went to the Watts' home, saw Shanann Watts' car in the garage, and found it suspicious when no one answered the door.

When Chris Watts arrived back home to talk to police, he said his wife told him she was taking the girls to a friend's house, but didn't specify which friend.

30/

August 13: After looking through the house, a neighbor invites Chris Watts and a police officer over to his property to review his home-surveillance footage, which disproves Chris Watts' story that his wife left with the girls while he was at work.

August 14, afternoon: Chris Watts appears on Denver 7 to talk about his wife and daughters' disappearance.

At one point, he said: "Shanann, Bella, Celeste, if you're out there, just come back. If somebody has her, just please bring her back. I need to see everybody, I need to see everybody again. This house is not complete without anybody here."

32/

August 15, evening: After police discover Chris Watts has a mistress and he fails a lie detector test, he admits to strangling his wife and burying her in a shallow grave at an oil site.

At the police station, Watts confessed to killing his wife to his father, left.The Denver Post

But he refused to take responsibility for the deaths of his daughters, saying Shanann Watts smothered them.

33/

August 15, 11:30 p.m.: Chris Watts is arrested on suspicion of three first-degree-murder charges and three charges of tampering with a deceased human body.

Weld County DA

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August 16, afternoon: Shanann Watts' body is found in a shallow grave near this oil site. The bodies of the girls were found in the two oil tanks.

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August 21: Shanann Watts' family appears in court as Chris Watts is arraigned.

November 6: Chris Watts pleads guilty to all nine counts against him in order to evade the death penalty.

A Polaroid picture of Chris Watts in jail in October.
Weld County DA

In pleading guilty to five counts of first-degree murder, Chris Watts changed his initial story that his wife killed their daughters and admitted to killing them himself. Two additional murder charges were added because the children were under the ages of 12.

He also pleaded guilty to three counts of tampering with a deceased human body and one count of unlawful termination of a pregnancy.

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November 15: Kessinger speaks out in an interview with The Denver Post.